Short for Solid-State Drive or Solid-State Disk, SSD is a drive that uses non-volatile memory as a means of storing and accessing data, much like computer RAM. Unlike a hard drives, an SSD has no moving parts, which gives it advantages such as accessing stored information faster, no noise, often more reliable, and consume less power. The picture shows a Crucial SSD and is an example of an SSD.
The first SSD was implemented in IBM supercomputers in the 1970s and 1980s. They have since been drastically improved upon and offer storage capacities of 128GB and 256GB for home computers. Unfortunately, because of the much greater cost per GB of storing information these drives have not yet become suitable solutions for replacing a standard computer's hard drive. However, are a great solution for netbooks, nettops, and other applications that don't require several hundred GB of space.